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09-30-2007, 02:34 PM | #1 |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
Aftermarket Intake Manifolds
I'm running a GT52 on a built 2.5 with V8 Spec C heads and some valvetrain upgrades. My question is this: would a long runner aftermarket intake manifold give me much of a gain? If yes, where in the powerband would it have the greatest effect?
Thanks, Eric
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09-30-2007, 11:06 PM | #2 |
Scooby Specialist
Member#: 127041
Join Date: Sep 2006
Location: Marietta, GA
Vehicle:02 WRX Midnight Blue Pearl |
Well if you elongate the runners on an intake manifold then you are more than likely going to see your torque numbers sooner and the power curve flattens out sooner.
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10-29-2007, 12:06 AM | #3 |
Scooby Newbie
Member#: 162882
Join Date: Oct 2007
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NWIC
Location: LACEY
Vehicle:04 wrx WRb |
what type of manifold would be best for the torque end i am looking around right now and i have no knowledge on a good manifold
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10-29-2007, 12:08 AM | #4 |
Scooby Specialist
Member#: 131371
Join Date: Nov 2006
Chapter/Region:
TXIC
Location: Belvitucky
Vehicle:05 buy my parts so i can get my sti running |
i kno the magnus intake manifold is amazing. it comes with ither long runners or short runners.....thats what im going to be using on my build
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10-29-2007, 12:27 AM | #5 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
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AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
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10-29-2007, 12:28 AM | #6 |
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
Vehicle:2002 Impreza WRX WRBlue Perl |
^^ reviews on that magnus intake manifold appear to be mixed. Some people like it, others tell you to stay away. Unfortunately more people have the latter to say, so it's hard to see how good or even reliable it is. I know one ex member here was stranded on the side of the road when his popped on him.
Then there is the availability factor also. Nobody seems to have them in stock..more so for the drive by cable version |
10-29-2007, 12:33 AM | #7 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
longer runners increase lower rpm volumetric efficiencies which translates into low end torque..the trade off is top end volumetric loss. This trade off can be reduced someif the manifold is properly designed to then catch another reflective wave at a higher rpm.
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